Sheet Binding Apparatus with Variable Tooth Engagement Depth
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Solution Overview
Problem
Existing sheet binding technologies face challenges in maintaining reliable binding without causing damage, especially when dealing with varying thicknesses and material types, as the pressure-contact binding method often results in easy unbinding or sheet damage due to inconsistent pressing forces.
Innovation Solution
A sheet binding processing apparatus featuring a pair of pressurizing faces with convex and concave tooth forms, where the engagement depth varies along the tooth width direction, allowing for strong binding near the sheet edge and gentle binding near the center, ensuring reliable binding without damaging thinner sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pressing force is enlarged to obtain strong binding, then binding strength is improved, but sheets are damaged
Solution Approach 1:
The pressurizing faces are designed with varying engagement depths across their width: the central portion has a first engagement depth while the both-end portions have a second engagement depth greater than the first. This local differentiation allows stronger pressing force at the ends for reliable binding while maintaining gentler pressure at the center to prevent sheet damage.
2Reliability
If uniform pressing force is applied across the entire pressurizing face, then binding consistency is simplified, but binding reliability varies with sheet bundle thickness
Solution Approach 1:
The pressurizing faces incorporate localized variation in engagement depth rather than uniform pressing force. The central portion and both-end portions have different engagement depths, creating zones of different pressing intensity suited for different regions of the sheet bundle.
Solution Approach 2:
Instead of varying pressing force in the vertical direction only, the invention introduces variation in the horizontal dimension (width direction) by creating different engagement depths at different横向 positions. This dimensional approach allows the same pressurizing face structure to adapt to varying sheet bundle thicknesses.
3Adaptability or versatility
If a single tooth form configuration is used for all sheet bundles, then device complexity is reduced, but binding performance is insufficient for both thick and thin sheet bundles
Solution Approach 1:
The pressurizing faces are designed with spatially varying engagement depths, creating different pressing characteristics at different locations. This allows a single pressurizing mechanism to effectively bind both thick and thin sheet bundles by utilizing the differentiated engagement zones.
Solution Approach 2:
The pressurizing faces with varied engagement depths serve multiple functions simultaneously: they provide strong binding for thick sheet bundles through the deeper engagement at the ends, and gentle binding for thin sheet bundles through the shallower engagement at the center, eliminating the need for multiple specialized mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration provides robust binding for thick sheets without damaging them and minimizes damage to thinner sheets by applying sufficient pressure only where needed, ensuring consistent binding across different sheet thicknesses and materials.
Implementation Method 1
a pair of pressurizing faces for pressure-nipping a sheet bundle are formed to have tooth forms each having a convex shape and a concave shape, the tooth forms being engaged with each other
Implementation Method 2
pressure-nipping the sheets in a front-back direction with pressurizing faces
Data Source
AI summary
The present invention is to provide a binding processing apparatus that prevents easy unbinding regardless of thickness of a sheet bundle to be bound and that lessens influence of damage on sheets. In the present sheet binding processing apparatus, a pair of pressurizing faces for pressure-nipping a sheet bundle are formed to have tooth forms each having a convex shape and a concave shape, the tooth forms being engaged with each other along a predetermined tooth width, and the tooth forms are shaped so that an engagement depth between a tooth top and a tooth root is varied along a tooth width direction toward a sheet end edge.